<!DOCTYPE html>
<html>
    <head>
        <script src="js/vue.js"></script>
    </head>
    <body>
        <div id="app1">app1: {{title}}</div>
        <div id="app2">app2: {{title}}</div>
        <script>
            var Vue2 = Vue.extend({
                data() {
                    return {title:'hello'}
                }
            })
            var vm1 = new Vue ({el:'#app1'})
            var vm2 = new Vue ({el:'#app2'})
        </script> 
    </body>
</html>